Abstract：The equations of motion are established referring to the current-unstressed configuration，by which the coupling between axial forces and bending moments is naturally considered without introducing geometric stiffness matrix. The iteration formulation is then given and its convergence is also discussed. The dynamic analysis of an 8-story frame is conducted. It is shown that，in comparison with the calculated results from the conventional method，the peak values of dynamic response are reasonably increasing，but the frequency responses remain nearly unchanged.
